* {
    padding: 0;
    margin: 0;
}

a {
    text-decoration: none;
    color: #222;
}
a:hover {
    color: #315efb;
}

.ClearFlat::after {/*清除浮动*/
    width: 0;
    height: 0;
    display: block;
    content: ' ';
    clear: both;
}

.float_left {
    float: left;
}

.float_right {
    float:right;
}

li {
    list-style: none;
    height: 20px;
    line-height: 20px;
}